Shelf divider



FIG. 1 is a perspective view of a shelf divider embodying my ornamental design;

FIG. 2 is a front end elevational view of the shelf divider.

FIG. 3 is a plan view of the shelf divider, and

FIG. 4 is an elevational view of the shelf divider showing the side opposite that shown in FIG. 1.

The shelf indicated by means of broken lines in FIG. 4 are shown for illustrative purposes only. 

The ornamental design of a shelf divider, as shown and described. 